Grant Aerona - Legionella Protection Functionality; Enabling DHW Heater Support for Disinfection; Configuring Legionella Protection Settings; Legionella Disinfection Scheduling

Section 7: Touchscreen Display Operation and SettingsPage 26
7.5 TIME SCHEDULES
The Grant Aerona Smart Controller allows for programmable time
schedules for the Heating Circuit(s), DHW and the Heat pump
itself.
In the situation when the consumer is not at home or at night, the
controller can decrease the amount of supplied heat which a󰀨ects
electric consumption.
Time schedules can be set separately for each day of the week or
copied across multiple days. If the space is unoccupied Monday
to Friday for the same time periods the user could set the hours
for Monday and then apply to multiple days.
! NOTE !
The ON/OFF time schedule is dened separately for the
heat pump and DHW cylinder.
Figure 7-6: Heating time schedule interface
Figure 7-7: DHW/Heat pump time schedule interface
Table 7-8: Time schedule controls
Button Function description
Navigation Arrows - Weekday selection and
time period selection. Navigate the required
day or move selected time period in the
specied direction.
Copy to - Copy the currently set schedule to
one or multiple days
Preset Night mode (Setback Temperature)
- Target night temperature for circuits will
be applied if a thermostat is assigned to the
circuit. If not, the decrease will be set to the
value of the Water temperature decrease.
Preset Day mode - Target day temperature
setting for circuits will be applied, if a ther-
mostat is assigned to the circuit.
ON Option is Congured 'ON'
OFF Option is Congured 'OFF'
Monday
11:30-12:00
24120
12:00 Mon.14.11.2022Schedule
Monday
11:30-12:00
ON
OFF
24120
12:00 Mon.14.11.2022Schedule
7.4 LEGIONELLA PROTECTION
The Grant Aerona Smart controller has the function to provide
protection against legionella by executing a scheduled
temperature increase. This is executed on a weekly basis from
within the Grant Aerona Smart controller settings.
For protection against legionella the DHW cylinder needs to be
periodically raised to a minimum of 60°C to ensure it is sterilised
of any present legionella bacteria.
Care must be given to vulnerable people who may be exposed
to potentially life-threatening legionella. This group of people
include the elderly, pregnant women, young children and those
with breathing di󰀩culties. Where legionella disinfection is required
more frequently than once a week, this must be provided by other
means.
It is important that this decision is based on the welfare of the
occupants and not on energy saving measures.
! WARNING !
If the hot water stored in the cylinder has not been used
for a prolonged period of time (e.g., a few days) and has
not been stored at 60°C, then it is important that the
temperature is raised to at least 60°C for a period of one
hour before using the hot water.
7.4.1 ENABLING DHW HEATER SUPPORT
'DHW heater' support must be enabled within the system settings
menu of the controller for 'disinfection' to be available.
1. Tap the Settings Menu button.
2. Tap 'Service settings' and input the password: '0000'.
Tap 'Enter' to conrm.
3. Tap 'Installation controller'.
4. Swipe the touchscreen to move down and tap 'Heaters'
5. Tap the button next to 'DHW Heater' to enable heater
support.
6. Tap and set 'DHW Delay' to '75mins' and conrm.
(To prevent the Immersion heater from operating during
a scheduled DHW demand period).
7. Tap '<' to navigate back.
7.4.2 CONFIGURING LEGIONELLA SETTINGS
Once DHW heater support has been enabled:
1. Navigate to the DHW circuit screen.
2. Tap the displayed temperature for the cylinder to enter the
DHW circuit settings.
3. Tap 'DHW additional settings' (Refer to Table 7-5).
4. Tap the button next to 'disinfection'. This will expand the
display for the individual settings for legionella protection for
conguration.
• 'Day' - Day to execute Legionella protection.
• 'Start Hour' - Time to start.
• 'Preset temp' - Temperature for DHW cylinder to heat to.
(Should not exceed 60°C).
! NOTE !
Legionella protection works independently of the DHW
cylinder schedule and will start even if DHW cylinder is
scheduled o󰀨.
7.4.3 LEGIONELLA DISINFECTION SCHEDULING
Legionella disinfection should be scheduled in a window that is a
minimum of 1 hour after a DHW demand and in a setback heating
demand period e.g. Overnight. This is to avoid the least amount of
loss in the heating circuits.
The Legionella protection can not be run twice in a week should
the schedule be changed within the settings.